Muffler for internal combustion engines



June 23, 1936. s. s. HANSON MUFFLER FOR INTERNAL COMBUSTION ENGINES Filed June 9, 1954 I a V .2 4

NVENTOR /L My ATTORNEY Patented June 23, 1936 UNITED STATES PATENT OFFICE MUFFLER FOR INTERNAL COMBUSTION ENGINES Application June 9, 1934, Serial No. 729,884

2 Claims.

The object of the invention is to provide a mufiler for internal combustion engines which will effectively silence the exhaust and very substantially or entirely relieve the engine of back pressure which is a usual result of muffling action, and comprising such elements that by varying the depth of the outer casing member, the internal members may be correspondingly varied in number so that compensation may be made for low power, high power and intermediate engines.

A further object of the invention is to so control the movement of the gases that cooling and contraction is rapidly produced.

The invention will be described with reference to the accompanying drawing, in which:

Fig. 1 is a longitudinal section through an embodiment of the invention.

Fig. 2 is a View in elevation of the elements separated and partly broken away to show their construction and relationship.

Fig. 3 is a fragmentary plan view of the device at its inlet end, the casing being partly broken away to expose the deflecting cone, and one of the separation rings, the latter being partly broken away.

Fig. 4 is a fragmentary plan view of one of the primary deflecting members.

In the drawing the inlet casing of the muffler is shown at I, it receiving a split pipe 2 for ready connection with the exhaust manifold of an internal combustion engine. The outlet casing section of the mufller is shown at 3. The annular abutting portions of the mufller sections may be tongue and groove to afford an efiective seat and the sections may be apertured to receive bolts such as 4 to secure the sections in rigid connection.

Located within the casing with its apex directed toward split pipe 2 is a reception cone 5, and held intermediate reception cone 5 and section I of the casing are a plurality of deflecting rings 6. Rings 6 are spaced from the inner wall of the casing by lugs 6m, Fig. 3 and each ring being formed at the top thereof with contiguous channelways 6m, each channelway being disposed tangentially of reception cone 5 so that the gases in passing over the surface of a ring 6 will be given a whirling motion.

The periphery of each ring 6 being held spaced from the inner casing wall by lug 6x, there are provided peripheral passageways spaced by said lugs through which the gases pass. Likewise conical deflector 5 is formed at its periphery with spaced lugs, one being shown at 5:0, Fig. 3, so that passageways are provided for the gases in their movement toward the outlet section 3 of the casing. The upper surface of member 5 is formed with spaced channels 5m: similar to those of the ring member 6 and for the same purpose.

Fitted within the reception cone 5 is the peripheral portion of a secondary deflecting member l which is formed with a central frustoconical section lac extending in a direction reverse to that of the apex of the reception cone 5 and having a central discharge opening. Lugs a carried by the peripheral margin of member 1 abut the inner wall of the reception cone thus providing passageways between the lugs for the flow of gases to the interior of the reception cone where they are given a whirling motion by channelways. b and thence pass toward the discharge end of the mufller through the outlet of member l. Member i is formed with an annular rib 0 against which abuts the base of the frusto-conical section of a deflecting member 8, said section being formed with contiguous channelways d directed reversely of the channelways 5m: and 6mm of the members 5 and 6 respectively. The base of the frusto-conical section of member 8 merges into a peripheral trough-like section having a scalloped-edge flange 8w abutting the lower peripheral margin of member 5, as shown in Fig. 1, member 8 also being formed with a peripheral scalloped flange 8am which abuts the inner wall of the muifier casing. The third annular flange 9 is carried by member 8 and extends in the same direction as flange 8a:. The periphery of flange 9 is scalloped. Also carried by member 8 and extending in a direction reverse to flange 8a: is a scalloped flange it). The frusto-conical section of member 8 is formed with a discharge opening, as shown more particularly in Fig. 1. In the embodiment shown two of the members 8 are employed, they being identical in formation.

The final deflecting member is generally similar in formation to member 8 in that it has a central frusto-conical section with a discharge opening, a trough-like periphery with the sealloped flange Br and the scalloped flange 8m: extending at right angles to the first named flange. Said member is indicated at I! and, like each member 8 is formed at the reverse side of the trough wall with channelways e for a purpose hereinafter to be described.

In the operation of the device, the gases in their discharge from the engine meet deflecting cone 5 and are thrown in a whirling motion toward the inner wall of the casing. They meet deflecting ring 6 and are split into three layers,

the layers being carried to a point below the reception cone and they are compelled to move in reverse direction, part of the gases passing into the hollow reception cone and being given a whirling motion by channelways b. The lighter gases pass through the frusto-conical section lac and meet the gases which pass over the surfaces of the primary deflecting member 8 and the final deflecting member II. In their passage over the upper surfaces of members 8 and H, the gases are first split into jet-like sections by the scalloped flanges, as, for example, 8x and I0, and are thence given whirling motion in a direction opposite that to which they are whirled by the channelways of members 5 and 6. By such travel of the gases the force thereof is dispelled and when they discharge from the final outlet l I, they have cooled and are contracted to such an extent as to substantially reduce back pressure.

Having described my invention, what I claim and desire to secure by Letters Patent, is as follows:

1. A mufller comprising connected casing members having an inlet and an outlet respectively, a defecting ring held within the casing toward the inlet end thereof, a hollow reception cone within the casing and having its apex directed toward the inlet, the periphery of said member having means for abutment with the deflecting ring and the ring having means for abutment with the casing whereby gas passageways are provided intermediate said abutment means, the deflecting ring and the deflecting cone being formed with channelways adapted to lead gases in paths whereby said gases are given rotational motion, channelways at the outer surface of the deflecting cone for directing the gases in a direction away from the apex of the cone in jet formation, a secondary deflecting member having an apertured frustoconical inner section directed reversely of the apex of the deflecting cone and providing a partial closure for the interior of said cone, and also providing guide walls to direct gases to and from the interior of said cone, and primary deflecting members intermediate the secondary deflecting member and the casing outlet and adapted to direct the gases in successive whirling and peripheral jet motion toward the casing outlet.

2. A muflier comprising connected casing members having an inlet and an outlet respectively, a deflecting ring held within the casing toward the inlet end thereof, a hollow reception cone within the casing and having its apex directed toward the inlet, said member having peripheral means for abutment with the deflecting ring and the ring having means for abutment with the casing whereby gas passageways are provided intermediate said abutment means, channelways carried on the upper surfaces of the deflecting ring and reception cone for imparting a whirling motion to the gases, a secondary deflecting member fitted within the reception cone, sections thereof being peripherally spaced from the cone to permit the inflow of gases, said secondary deflecting member having an apertured frusto-conical inner section directed reversely of the deflecting cone apex, and a plurality of deflecting members intermediate the secondary deflecting member and the casing outlet, said last named deflecting members being provided with a plurality of peripherally disposed annular scalloped bafile walls for directing the gases in jet formation, and with a plurality of face channelways adapted to impart whirling motion to the gases, each of said deflecting members intermediate the secondary deflecting memher and the casing outlet having axially disposed discharge openings.

SOREN S. HANSON. 

